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Mathiew M, Tan JK, Chan PWH. Gold‐Catalyzed Double Cycloisomerization of 1‐Ene‐4,10‐diynyl Esters to Bicyclo[6.3.0]undeca‐2,4,9‐trienyl Esters. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201809376] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Jin J, Zhao Y, Gouranourimi A, Ariafard A, Hong Chan PW. Chiral Brønsted Acid Catalyzed Enantioselective Dehydrative Nazarov-Type Electrocyclization of Aryl and 2-Thienyl Vinyl Alcohols. J Am Chem Soc 2018; 140:5834-5841. [PMID: 29631393 DOI: 10.1021/jacs.8b02339] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
An efficient chiral Brønsted acid-catalyzed enantioselective dehydrative Nazarov-type electrocyclization (DNE) of electron-rich aryl- and 2-thienyl-β-amino-2-en-1-ols is described. The 4π conrotatory electrocyclization reaction affords access to a wide variety of the corresponding 1 H-indenes and 4 H-cyclopenta[ b]thiophenes in excellent yields of up to 99% and enantiomeric excess (ee) values of up to 99%. Experimental and computational studies based on a proposed intimate contact ion-pair species that is further assisted by hydrogen bonding between the amino group of the substrate cation and chiral catalyst anion provide insight into the observed product enantioselectivities.
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Chen X, Merrett JT, Hong Chan PW. Gold-Catalyzed Formal [4 + 2] Cycloaddition of 5-(Ethynylamino)pent-2-yn-1-yl Esters to 1,2,3,5-Tetrahydrobenzo[g]quinolines. Org Lett 2018; 20:1542-1545. [DOI: 10.1021/acs.orglett.8b00267] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Day DP, Henry SA, Zhao Y, Jin J, Clarkson GJ, Chan PWH. Brønsted Acid-Catalysed Allylic Amination of 1-(2-Aminoaryl)prop-2-en-1-ols to 1,2-Dihydroquinolines. Aust J Chem 2018. [DOI: 10.1071/ch18191] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A highly efficient synthetic method to prepare 1,2-dihydroquinolines that relies on trifluoromethanesulfonic acid (TfOH)-catalysed allylic amination of 1-(2-aminoaryl)prop-2-en-1-ols is described. Achieved at a catalyst loading of 0.01 mol-% under mild conditions at room temperature, the reaction was found to be robust, with a wide range of substitution patterns tolerated. The corresponding N-heterocyclic adducts were obtained in good to excellent yields of 45–93 %.
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Chen C, Chen X, Zhang X, Wang S, Rao W, Chan PWH. Gold‐Catalyzed Dehydrogenative Cycloisomerization of 1,4‐Enyne Esters to 3,5‐Disubstituted Phenol Derivatives. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201701068] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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31
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Tan JK, Mathiew M, Nayak S, Chan PWH. Brønsted Acid-Mediated Cycloaromatization of 1H-Indol-2-yl Propargyl Benzoates to 7H-Benzo[c]carbazoles. Chem Asian J 2017; 12:1475-1479. [PMID: 28608646 DOI: 10.1002/asia.201700419] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2017] [Revised: 04/07/2017] [Indexed: 01/18/2023]
Abstract
A synthetic method for the efficient assembly of benzo[c]carbazole derivatives that relies on silica gel-activated benzoic acid-mediated cycloaromatization of 1H-indol-2-yl propargyl benzoates under atmospheric conditions is described. Robust with a variety of substitution patterns tolerated, the reaction provides a one-step strategy to construct a member of the N-heterocycles family in good to excellent yields. A tentative mechanism is proposed in which the cycloaromatization process is thought to involve a Brønsted acid-mediated formal 1,3-acyloxy migration/6π-electrocyclization pathway.
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Zhao Y, Jin J, Boyle JW, Lee BR, Day DP, Susanti D, Clarkson GJ, Chan PWH. Silver-Catalyzed 1,3-Acyloxy Migration/Diels–Alder Reaction of 1,9-Dien-4-yne Esters to Partially Hydrogenated Isoquinolines. J Org Chem 2017; 82:2826-2834. [DOI: 10.1021/acs.joc.7b00048] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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33
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Tejo C, Tirtorahardjo D, Day DP, Ma DL, Leung CH, Chan PWH. Brønsted Base-Mediated Aziridination of 2-Alkyl-Substituted-1,3-Dicarbonyl Compounds and 2-Acyl-Substituted-1,4-Dicarbonyl Compounds by Iminoiodanes. Aust J Chem 2017. [DOI: 10.1071/ch16580] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The synthesis of α,α-diacylaziridines and α,α,β-triacylaziridines from reaction of 2-alkyl-substituted-1,3-dicarbonyl compounds and 2-acyl-substituted-1,4-dicarbonyl compounds with arylsulfonyliminoiodinanes (ArSO2N=IPh) under Brønsted base-mediated atmospheric conditions is described. The reaction mechanism is thought to involve the formal oxidation of the substrate followed by aziridination of the ensuing α,β-unsaturated intermediate by the hypervalent iodine(iii) reagent.
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Chen X, Day DP, Teo WT, Chan PWH. Gold- and Brønsted Acid-Catalyzed Cycloisomerization of 1,8-Diynyl Vinyl Acetates to Bicyclo[2.2.1]hept-2-en-7-ones. Org Lett 2016; 18:5936-5939. [DOI: 10.1021/acs.orglett.6b03049] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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35
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Chen C, Zou Y, Chen X, Zhang X, Rao W, Chan PWH. Gold-Catalyzed Tandem 1,3-Migration/Double Cyclopropanation of 1-Ene-4,n-diyne Esters to Tetracyclodecene and Tetracycloundecene Derivatives. Org Lett 2016; 18:4730-3. [PMID: 27589481 DOI: 10.1021/acs.orglett.6b02404] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A synthetic method that relies on Au(I)-catalyzed tandem 1,3-acyloxy migration/double cyclopropanation of 1-ene-4,9-diyne and 1-ene-4,10-diyne esters to construct the respective architecturally challenging tetracyclodecene and tetracycloundecene derivatives is described. Achieved under mild reaction conditions, the transformation was shown to be robust with a wide variety of substitution patterns tolerated to give the two members of the carbocyclic family in good to excellent yields and as a single regio- and diastereomer.
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Kothandaraman P, Zhao Y, Lee BR, Le Ng CJ, Lee JY, Ayers BJ, Chan PWH. Cover Picture: Gold-Catalyzed Aminoalkenylation of β-Amino-1, n
-Diynols to Cycloalkyl-, Piperidinyl- and Pyranyl-Fused Pyrroles (Adv. Synth. Catal. 9/2016). Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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37
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Kothandaraman P, Zhao Y, Lee BR, Le Ng CJ, Lee JY, Ayers BJ, Chan PWH. Gold‐Catalyzed Aminoalkenylation of β‐Amino‐1,
n
‐Diynols to Cycloalkyl‐, Piperidinyl‐ and Pyranyl‐Fused Pyrroles. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600011] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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38
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Day DP, Chan PWH. Gold‐Catalyzed Cycloisomerizations of 1,
n
‐Diyne Carbonates and Esters. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600005] [Citation(s) in RCA: 124] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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39
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Rao W, Boyle JW, Chan PWH. Gold‐Catalyzed Sequential Cyclization of 1‐En‐3,9‐Diyne Esters to Partially Hydrogenated 3
H
‐Dicyclopenta[
a
,
b
]naphthalenes. Chemistry 2016; 22:6532-6. [DOI: 10.1002/chem.201600915] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Indexed: 12/25/2022]
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Zhong HJ, Lee BR, Boyle JW, Wang W, Ma DL, Hong Chan PW, Leung CH. Structure-based screening and optimization of cytisine derivatives as inhibitors of the menin-MLL interaction. Chem Commun (Camb) 2016; 52:5788-91. [PMID: 27004852 DOI: 10.1039/c6cc01079b] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The natural product-like compound 1 was identified as a direct inhibitor of the menin-MLL interaction by in silico screening. Structure-based optimization furnished analogue 1a, which showed significantly higher potency than both the lead structure 1 and the reference compound MI-2.
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Ma DL, Wang W, Mao Z, Kang TS, Han QB, Chan PWH, Leung CH. Utilization of G-Quadruplex-Forming Aptamers for the Construction of Luminescence Sensing Platforms. Chempluschem 2016; 82:8-17. [DOI: 10.1002/cplu.201600036] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2016] [Revised: 03/07/2016] [Indexed: 01/01/2023]
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42
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Kumar GS, Boyle JW, Tejo C, Chan PWH. Copper-Mediated Cross-Dehydrogenative Coupling of 2-Methylpyridine and 8-Methylquinoline with Methyl Ketones and Benzamides. Chem Asian J 2015; 11:385-9. [PMID: 26586026 DOI: 10.1002/asia.201501096] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Indexed: 11/09/2022]
Abstract
A synthetic method to prepare (E)-(pyridin-2-yl)enones and (E)-(quinolin-8-yl)enones that relies on the respective copper(I)-catalyzed formal cross-dehydrogenative coupling (CDC) reaction of 2-methylpyridine and 8-methylquinoline with methyl ketones has been discovered. The mechanism was delineated to follow a pathway involving oxidation of the N-heterocycle to its corresponding aldehyde adduct prior to reaction with the methyl ketone. The versatility and substrate dependent divergence in the reactivity of the copper-mediated CDC strategy was exemplified by its application to the synthesis of N-(quinolin-8-ylmethyl)amide and N-(quinolin-8-ylmethyl)aniline adducts on switching the cross-coupling partner to benzamides or an aniline derivative.
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Tejo C, See YFA, Mathiew M, Chan PWH. Synthesis of 1,4-amino alcohols by Grignard reagent addition to THF and N-tosyliminobenzyliodinane. Org Biomol Chem 2015; 14:844-8. [PMID: 26626538 DOI: 10.1039/c5ob02302e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The synthesis of 1,4-amino alcohols from THF treated with N-tosyliminobenzyliodinane (PhINTs) followed by a Grignard reagent under mild reaction conditions at room temperature is described herein. Various Grignard reagents were shown to be compatible, furnishing the corresponding 4-substituted-N-1,4-tosylamino alcohols in good to excellent yields. A partial or full detosylation of the N-tosyl-1,4-amino alcohol was observed in instances involving a sterically bulky Grignard reagent, leading to the deprotected 1,4-amino alcohol product in moderate to good yields. The synthetic utility of this protocol was demonstrated by the synthesis of a 5-substituted-N-tosyl-1,5-amino alcohol from THP and the conversion of two examples to their corresponding γ-lactam and pyrrolidine adducts.
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Wang W, Kang TS, Chan PWH, Lu JJ, Chen XP, Leung CH, Ma DL. A label-free G-quadruplex-based mercury detection assay employing the exonuclease III-mediated cleavage of T-Hg 2+-T mismatched DNA. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2015; 16:065004. [PMID: 27877846 PMCID: PMC5069990 DOI: 10.1088/1468-6996/16/6/065004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Revised: 11/03/2015] [Accepted: 11/04/2015] [Indexed: 05/30/2023]
Abstract
We report herein the use of an exonuclease III and G-quadruplex probe to construct a G-quadruplex-based luminescence detection platform for Hg2+. Unlike common DNA-based Hg2+ detection methods, when using the dsDNA probe to monitor the hairpin formation, the intercalation of the dsDNA probe may be influenced by the distortion of dsDNA. This 'mix-and-detect' methodology utilized the G-quadruplex probe as the signal transducer and is simple, rapid, convenient to use and can detect down to 20 nM of Hg2+.
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Yan J, Tay GL, Neo C, Lee BR, Chan PWH. Gold-Catalyzed Cycloisomerization and Diels-Alder Reaction of 1,6-Diyne Esters with Alkenes and Diazenes to Hydronaphthalenes and -cinnolines. Org Lett 2015; 17:4176-9. [PMID: 26291118 DOI: 10.1021/acs.orglett.5b01935] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A method for the efficient preparation of hydronaphthalene and -cinnoline derivatives by Au(I)-catalyzed cycloisomerzation of 1,6-diyne esters followed by a Diels-Alder reaction with alkenes or diazenes under mild conditions at room temperature with catalyst loadings as low as 1 mol % is described.
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Chan PWH, Teo WT, Koh SWY, Lee BR, Ayers BJ, Ma DL, Leung CH. Silver Triflate Catalyzed Cyclopropyl Carbinol Rearrangement for Benzo[b]oxepine and 2H-Chromene Synthesis. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500374] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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47
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Susanti D, Liu LJ, Rao W, Lin S, Ma DL, Leung CH, Chan PWH. Gold-Catalyzed Cycloisomerization and Diels-Alder Reaction of 1,4,9-Dienyne Esters to 3 a,6-Methanoisoindole Esters with Pro-Inflammatory Cytokine Antagonist Activity. Chemistry 2015; 21:9111-8. [DOI: 10.1002/chem.201500795] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Indexed: 11/10/2022]
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48
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Rao W, Susanti D, Ayers BJ, Chan PWH. Ligand-Controlled Product Selectivity in Gold-Catalyzed Double Cycloisomerization of 1,11-Dien-3,9-Diyne Benzoates. J Am Chem Soc 2015; 137:6350-5. [DOI: 10.1021/jacs.5b02377] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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49
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Ganguly R, Sally, Chan PWH. Crystal structure of (Z)-1-phenyl-3-styryl-undeca-2-en-4,10-diyn-1-ol. ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS 2015; 71:o64. [PMID: 25705512 PMCID: PMC4331854 DOI: 10.1107/s205698901402742x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2014] [Accepted: 12/16/2014] [Indexed: 11/10/2022]
Abstract
The molecule of the title compound, C25H24O, obtained by acid-catalysed 1,3-migration of an alcohol group, is T-shaped. The planes of the two phenyl rings are inclined to one another by 81.9 (2)°. In the crystal, molecules are linked by O—H⋯O hydrogen bonds, forming chains along [001].
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Liu LJ, Leung KH, Lin S, Chan DSH, Susanti D, Rao W, Chan PWH, Ma DL, Leung CH. Pharmacophore modeling for the identification of small-molecule inhibitors of TACE. Methods 2015; 71:92-7. [DOI: 10.1016/j.ymeth.2014.09.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Revised: 09/02/2014] [Accepted: 09/14/2014] [Indexed: 01/27/2023] Open
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